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      1 # clock_time.m4 serial 6
      2 dnl Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
      3 dnl This file is free software; the Free Software Foundation
      4 dnl gives unlimited permission to copy and/or distribute it,
      5 dnl with or without modifications, as long as this notice is preserved.
      6 
      7 # Check for clock_gettime and clock_settime, and sets LIB_CLOCK_GETTIME.
      8 AC_DEFUN([gl_CLOCK_TIME],
      9 [
     10   # dnl Persuade glibc <time.h> to declare these functions.
     11   AC_REQUIRE([AC_GNU_SOURCE])
     12 
     13   # Solaris 2.5.1 needs -lposix4 to get the clock_gettime function.
     14   # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
     15 
     16   # Save and restore LIBS so e.g., -lrt, isn't added to it.  Otherwise, *all*
     17   # programs in the package would end up linked with that potentially-shared
     18   # library, inducing unnecessary run-time overhead.
     19   gl_saved_libs=$LIBS
     20     AC_SEARCH_LIBS(clock_gettime, [rt posix4],
     21                    [test "$ac_cv_search_clock_gettime" = "none required" ||
     22                     LIB_CLOCK_GETTIME=$ac_cv_search_clock_gettime])
     23     AC_SUBST(LIB_CLOCK_GETTIME)
     24     AC_CHECK_FUNCS(clock_gettime clock_settime)
     25   LIBS=$gl_saved_libs
     26 ])
     27